Conductive material for lithium secondary battery and electrode for lithium secondary battery including the same

A method of manufacturing a secondary battery containing a pitch coated graphene sheet as a conductive material in an anode of the secondary battery, the method comprising:

• forming a pure graphene sheet;
• mixing the graphene sheet and the coal-based pitch to form a mixture consisting of the graphene sheet and the coal-based pitch;
• baking the mixture at a high temperature to manufacture the pitch coated graphene sheet, wherein the baking at the high temperature is conducted by maintaining at 250° C. for 3 hours under an air atmosphere, increasing the temperature at a rate of 2° C./min to 1,150° C. under a nitrogen atmosphere, and baking at 1,150° C. for 5 hours for carbonization to form the pitch coated graphene sheet;
• and
• making an anode slurry comprising an anode active material, a binder and a conductive material wherein the conductive material consists of the pitch coated graphene sheet,
• wherein the pitch coated graphene sheet is included in an amount of 1 to 15 wt % based on a total amount of the anode active material in the anode slurry,
• wherein the pitch is included in an amount of 6 to 15 wt % based on a total amount of the conductive material for the secondary battery.